Underbody structure of vehicle

Abstract

A floor center member extends through a central part of a body floor of a vehicle and a longitudinal direction of the vehicle, and a first floor cross member penetrates the floor center member to extend in a lateral direction of the vehicle. The floor center member includes a coupling flange counter to a top wall of the first floor cross member. The coupling flange is coupled to the first floor cross member, by a bolt and a nut.

The invention claimed is: 
     
       1. An underbody structure of a vehicle, comprising:
 a floor center member disposed on a body floor of the vehicle, the floor center member extending through a central part of the body floor and along a longitudinal direction of the vehicle; and 
 a floor cross member disposed on the body floor of the vehicle, the floor cross member penetrating the floor center member to extend in a lateral direction of the vehicle, wherein 
 the floor center member includes a coupling flange counter to a surface of the floor cross member, and the coupling flange is coupled to the floor cross member, by a fastening component. 
 
     
     
       2. The underbody structure of the vehicle according to  claim 1 , further comprising a seat anchor block disposed on a top face of the floor cross member, the seat anchor block to which a leg of a vehicle seat is fixed, wherein the floor center member is coupled to the floor cross member, by the fastening component, at a location that is inside relative to the seat anchor block in the lateral direction of the vehicle. 
     
     
       3. The underbody structure of the vehicle according to  claim 1 , wherein the fastening component includes a weld nut disposed on an inner surface of the floor cross member and a bolt that is screwed into the weld nut to couple the floor center member to the floor cross member. 
     
     
       4. The underbody structure of the vehicle according to  claim 1 , further comprising a pair of rockers,
 wherein the floor cross member includes a pair of ends, each of the pair of ends of the floor cross member is connected to a respective rocker of the pair of rockers. 
 
     
     
       5. The underbody structure of the vehicle according to  claim 1 , wherein the floor cross member penetrates the floor center member so as to extend through the floor cross member in the lateral direction. 
     
     
       6. The underbody structure of the vehicle according to  claim 1 , wherein the floor center member includes a pair of side openings, and
 the floor cross member extends through the side openings. 
 
     
     
       7. The underbody structure of the vehicle according to  claim 6 , wherein the coupling flange is positioned on an upper marginal part of one of the side openings.